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He may have seen you reaching into the glove box while he was walking up. That's a no-no. Always keep your hands on the wheel until the officer gets there, and then tell him/her what you're about to do, and have them watch you. Especially young cops, they're a little more itchy on the trigger finger.

Like he said....

The officer doesn't know what you are reaching for, could be a breath mint, but they are trained to assume it is a gun.